Event: Division 4

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Opponent	Rating	Result
David Stewardson	1589	0 - 1
Ian R Rook	1513	1 - 0
Joel Tofield-Brown	1669	0 - 1
Dennis Patterson	1432	1 - 0
David Stewardson	1618	½ - ½
Ian R Rook	1492	1 - 0
Dennis A White	1546	0 - 1
Robert Heyman	1561	½ - ½

performance = (sum(opponents ratings) + 400(wins-losses)) / games

1553 = (12420 + 400 * (3 - 3)) / 8)